A drought is a destructive force because a drought is when a place or area doesn't have water for a curtain amount of time.
Volcanoes are both a constructive and destructive force because a volcano constructs a landform and it is deconstructive because the lava destroys every this in its path.
Tsunamis are destructive because they can destroy houses and piers.
Fire is a destructive force because it can burn down houses.
Mountains are constructive forces because they are landforms.,
Islands are constructive because they are landforms as well as mountains.